Chinese Optics, Volume. 15, Issue 1, 90(2022)
Calibration of single optical wedge compensation test system error by computer generation hologram
Fig. 1. (a) Single optical wedge test optical path. (b) Schematic of the test wavefront.
Fig. 2. (a) Surface shape of the optical wedge A. (b) Surface shape of optical wedge B. (c) Transmitted wave aberration. (d) Transmission sphere system error. (e) Tap#1 non-null error. (f) Tap#2 non-null error. (g) Tap#3 non-null error.
Fig. 5. Main area of the CGH. (a) Design residual; (b) diffraction order energy level distribution; (c) diffraction pattern; (d) surface phase setting parameters
Fig. 6. Schematic of the single optical wedge deflection light path
Fig. 7. Alignment area. (a) Design residual; (b) diffraction order energy level distribution; (c) diffraction pattern
Fig. 9. Convex spherical stitching test result (
Fig. 10. (a) Calibration optical path diagram of optical wedge compensator. (b) CGH and interferometer aligned on the optical path. (c) Insertion of the optical wedge compensator
Fig. 11. Calibration results for the test path system error. (a) CGH alignment result by Tap#2. (b) Test path system error by Tap#2. (c) CGH alignment result by Tap#3. (d) Test path system error by Tap#3
Table 1. Basic parameters
View tableView in ArticleTable 1. Basic parameters
Item Tap#1 Tap#2 Tap#3 Sub-aperture planning Number 1/21 8/21 12/21 Off-axis/mm 0 145 175 Subaperture/mm 118 114 116 Departure/μm 0.74 19.2 28.5 Need compensation × √ √ Optical wedge structure parameters Diameter /mm 150 150 Centre thickness /mm 20 20 Tilt/(°) 3.2 0.77 Wedge/(°) 6.3 6.3 Material F_Silica F_Silica
Table 2. Adjustment tolerance analysis of the optical wedge compensator
View tableView in ArticleTable 2. Adjustment tolerance analysis of the optical wedge compensator
Wedge-interferometer dist./mm Wedge-mirror. dist./mm x-tilt /(°) y-tilt /(°) Eccentric eccentricity/mm RMS Test system 0.15 0.15 0.005 0.01 3 9.21×10−3λ Calibration system 0.05 0.05 0.0015 0.001 0.05 8.35×10−3λ
Table 3. CGH fringe contrast
View tableView in ArticleTable 3. CGH fringe contrast
Diffraction order Amplitude CGH Phase CGH 0 73.05% ±1 93.09% 61.08% ±3 78.92% 99.97% ±5 54.01% 87.29%
Table 4. CGH error
View tableView in ArticleTable 4. CGH error
Error type Value design residual 1.77×10−5λ coding error 9.00×10−4λ substrate error 3.00×10−3λ characterization distortion 1.57×10−4λ RMS 3.10×10−3λ
Table 5. Single optical wedge compensation test accuracy after CGH calibration
(nm) View tableView in ArticleTable 5. Single optical wedge compensation test accuracy after CGH calibration
(nm) Error Value Measuring random error 2.5 CGH calibration test optical path system error 1.98 Accuracy of stitching algorithm 1.26 RMS 3.43
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Zhi-hua CAI, Xiao-kun WANG, Hai-xiang HU, Qiang CHENG, Ruo-qiu WANG, Hai-dong ZHANG. Calibration of single optical wedge compensation test system error by computer generation hologram[J]. Chinese Optics, 2022, 15(1): 90
Category: Original Article
Received: Mar. 2, 2021
Accepted: --
Published Online: Jul. 27, 2022
The Author Email: Xiao-kun WANG (jimwxk@sohu.com), Hai-xiang HU (hhx@ciomp.ac.cn)
